| Patents for H04Q 1 - Details of selecting apparatus or arrangements (11,745) |
|---|
| 10/03/1978 | CA1039867A1 System for addressed timemultiplexed telecommunication |
| 10/03/1978 | CA1039836A1 Method and apparatus for fault testing multiple stage networks |
| 09/26/1978 | US4117273 Single sided protector frame for telephone circuits |
| 09/26/1978 | US4117264 Diode package for use with a central office connector module |
| 09/19/1978 | CA1038952A1 Dial pulse receiver |
| 09/12/1978 | US4113340 Protective electrical device |
| 09/05/1978 | CA1038081A2 Paper currency validator |
| 08/29/1978 | US4110565 Duplex telephone signalling system |
| 08/22/1978 | US4109109 Method and apparatus for detecting the presence of signal components of predetermined frequency in multifrequency pcm signal |
| 08/15/1978 | US4107475 Receiver apparatus for detection of two voice frequencies in a multifrequency tone signal |
| 08/15/1978 | CA1036733A2 Station loop control arrangement for telephone switching system |
| 08/15/1978 | CA1036732A2 Station loop control arrangement for telephone switching system |
| 08/15/1978 | CA1036731A2 Station loop control arrangement for telephone switching system |
| 07/18/1978 | US4101733 Electronic DX signaling circuit |
| 07/11/1978 | US4100378 Cross-correlation arrangement |
| 07/11/1978 | US4099823 High density multipair cable connecting block |
| 07/11/1978 | US4099819 Modular termination system for telecommunication devices |
| 07/04/1978 | US4099125 Frequency error correction circuit |
| 06/27/1978 | US4097812 Frequency selective detector circuit |
| 06/20/1978 | US4096359 Key telephone system interconnection apparatus |
| 05/30/1978 | US4092499 Apparatus for detecting a voice frequency signal |
| 05/30/1978 | US4092489 Switching arrangement for monitoring polarity reversal on lines in telecommunication systems |
| 05/23/1978 | US4091243 Multifrequency signal receiver |
| 05/16/1978 | US4089577 Distributing device for a multiconductor cable |
| 05/09/1978 | US4088838 Voice response system |
| 05/02/1978 | US4087655 Cable terminating and testing unit |
| 05/02/1978 | US4087649 Pulse counting circuit |
| 05/02/1978 | US4087648 Modular connector for switching frame |
| 05/02/1978 | US4087646 Dual mode telephone subscriber loop current detector |
| 05/02/1978 | US4087644 Dial impulse relay circuit |
| 04/25/1978 | US4086440 Telephone set with loop current interruption timing control |
| 04/18/1978 | US4085295 Multi-frequency signal receivers |
| 04/04/1978 | US4082924 Reference signal circuit in a receiver for detecting two frequencies in a multifrequency tone signal |
| 03/21/1978 | US4080516 Multi-frequency signal receiver |
| 02/28/1978 | US4076967 Trunking procedure and arrangement for the connection of functional units |
| 02/28/1978 | US4076965 Universal receiver/sender |
| 02/21/1978 | US4075569 Digital method and apparatus for dynamically generating an output pulse train having a desired duty cycle from an input pulse train |
| 02/21/1978 | US4075513 Averaging and peak detection circuit |
| 01/31/1978 | US4071879 Reversible current apparatus |
| 01/31/1978 | US4071840 Switching device for reed relays in a matrix |
| 01/31/1978 | US4071708 Dial pulse detector |
| 01/24/1978 | US4070631 Digital noise blanking circuit |
| 01/10/1978 | US4068309 Method and device for detecting two different frequency amplitude and phase signals in a combined digital signal |
| 01/10/1978 | US4068104 Interface for in band SCPC supervisory and signalling system |
| 01/03/1978 | US4066846 Combined rotary dial and touch-tone telephone decoding system |
| 12/20/1977 | US4064488 Sampled signal detector |
| 12/06/1977 | US4061885 Digital tone decoder |
| 11/29/1977 | US4060797 Serial digital bit stream code detector |
| 11/08/1977 | US4057843 Cable connection units and protection devices |
| 11/08/1977 | US4057692 Protector apparatus for telecommunications lines |
| 11/01/1977 | US4056691 Telephone subscriber line circuit |
| 10/25/1977 | USRE29460 PCM tone receiver using optimum statistical technique |
| 10/25/1977 | US4055730 Circuit for detecting dial pulses |
| 10/11/1977 | US4053719 Connector blocks for telecommunications lines |
| 09/27/1977 | US4051385 Active networks and signalling equipment |
| 09/13/1977 | US4048450 Trunk circuit traffic analyzer |
| 09/06/1977 | US4047114 Digital detector |
| 08/30/1977 | US4045620 Digital tone detector |
| 08/23/1977 | USRE29371 Connecting block |
| 08/23/1977 | US4044206 Digital decoder for multiple frequency telephone signalling |
| 08/16/1977 | US4042790 Voice guard circuit for a tone receiver |
| 08/16/1977 | US4042789 Tone combination detector and coincidence timer circuit |
| 08/16/1977 | US4042788 Tone detector |
| 08/16/1977 | US4042787 Output processing and output coupling circuit for a digital tone receiver |
| 08/09/1977 | US4041547 Connector system for connecting together terminal posts arranged in two matrices whose rows and columns are interleaved |
| 08/09/1977 | US4041248 Tone detection synchronizer |
| 07/26/1977 | US4037910 Telephone distribution frame connector assembly |
| 07/19/1977 | US4037171 High speed tone decoder utilizing a phase-locked loop |
| 07/12/1977 | US4035587 Wire termination block switching arrangement |
| 07/05/1977 | US4034300 Circuit arrangement for evaluating received oscillations of a predetermined frequency |
| 06/07/1977 | US4028501 Method and apparatus for translating multiple frequency signalling |
| 05/31/1977 | US4027102 Voice versus pulsed tone signal discrimination circuit |
| 05/24/1977 | US4025730 In-band signal receiver |
| 05/10/1977 | US4022985 Key telephone system with a common push-button sender system |
| 05/03/1977 | US4021653 Digital programmable tone detector |
| 05/03/1977 | US4021620 Multifrequency signal receiver with digital tone receiver |
| 04/19/1977 | US4019114 Circuit arrangement for the ungrounded transmission of signals through testing points in communication facilities |
| 04/19/1977 | US4018996 Communication network protection system |
| 04/19/1977 | US4018991 Multifrequency signal parity detector |
| 04/05/1977 | US4016371 Frequency tone detection |
| 04/05/1977 | US4016370 Digital tone decoder |
| 03/15/1977 | US4012096 Telephone connector block apparatus |
| 03/01/1977 | US4010328 Out-of-band signaling method and apparatus to adapt payphones to telephone systems |
| 02/22/1977 | US4009354 Signalling device for key telephone systems |
| 02/22/1977 | US4009353 Analog signal detection |
| 01/18/1977 | US4004261 Connection device |
| 01/18/1977 | US4004238 Method and apparatus for the removal of ringing phenomena from signal impulses |
| 01/18/1977 | US4004105 Multifrequency signal receiver for use in telephone signaling systems or the like |
| 01/11/1977 | US4002856 Modular distribution frame assembly |
| 01/11/1977 | US4002848 Toll fraud eliminator for telephone systems |
| 01/04/1977 | US4001521 Signal identification system |
| 12/28/1976 | US4000363 Arrangement for the production of selection pulses in teleprinters |
| 12/21/1976 | US3999013 Bi-directional signaling apparatus |
| 12/14/1976 | US3997727 Time division multiplexed digital switching apparatus |
| 11/30/1976 | US3995118 Call processing restoration arrangement for a telephone switching system |
| 11/23/1976 | US3993875 Tone receiver |
| 11/09/1976 | US3991324 Dial pulse detector |
| 11/09/1976 | US3990763 Telephone cable adapter |
| 11/02/1976 | US3990006 Digital tone detector using concatenated detection intervals |
| 11/02/1976 | US3988825 Method of hermetically sealing an electrical component in a metallic housing |